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Topic: Arduino due and pir sensor (Read 2286 times) previous topic - next topic


Hi.. I am a newbie and I am planning a simple school project, I decided to use and already bought the new Arduino Due to use then with PIR sensors. I just read that the new card has a processor working at 3.3 V. .. My question is this, the Arduino supports, manages four PIR sensors that need a 3-5V power supply and release a digital signal of 4V (HIGH) and 0.4 V (LOW), without burning the processor or damage the card ??
This is the sensor: http://www.homotix.it/catalogo/infrarossi/digital-infrared-motion-sensor-s75
Thanks for availability.


My suggestion:
(I have never used this sensor)

  • Plan to power the sensor with 3.3V instead of 5V.

  • Power the sensor up on the bench with 3.3V, and measure the output voltage range.

If the alarm output max voltage is <= 3.3V, then your good to go.

Chances are, it will be fine, as the digital alarm output voltage is most-likely limited to the excitation voltage of 3.3V.  To be certain, measure it before connecting the alarm output to the DUE.


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